Nibbling machine



Oct.' 5, 1937. K. G. STBERG NIBBLING MACHINE Filed July 16, 1936 Patented Oct. 5, 1937 UNITED STATES 2,094,928 NIBBLING MACHINE Karl Gustaf stberg, Stockholm, Sweden, assignor 'to Fabriksaktieholaget Haldataxametern, Sweden Holmstad, Sweden, a. company of Application July is, 1936, serial No. 90,989 In Sweden July 20, 1935.

10 Claims.

Ihe invention relates to a machine for working, especially shearing metal plates and other sheet material. It relates particularly to such machines in which the shearing is effected by cutting or stamping out a narrow strip from the plate. Machines of this kind are known, which consist substantially of a support for the metal plate in the shape of astamping pad and of a stamp or punch movable up and down through a recess in saidsupport, and in whichthe guiding. means andthe driving mechanism are arranged below the supporting surface for the plate. Such machines have the advantage of being free from any superstructure above the working table which would take up much roomabove the table and would bar the feeding of the plate to the stamp. O n account of the great stresses to which the stamp and the motion mechanism are subjected in said type of machines it has, however, been diilicult ,to Vfind a. suitable design for the stamp and the motion mechanism. The present invention has for its object to provide an improvement in this respect in machines of the kind mentioned 4and consists substantially therein that the stamp is swingably mounted in the support. It is hereby rendered possible to obtain a secure and reliable mounting and guiding of the stamp, and in addition the transmission of movement can be ar- A ranged in a more simple manner by means of rotating members only, resulting in a compact and 4reliable construction. For the transmission of movement there is preferably employed a socalled waddling disk which may be pivotally.

I mounted in the working table proper immediately below the upper surface of the table and may be arranged to beV driven from a shaft which is perpendicular to said surface.

The invention will be described more in detail with reference to the accompanying drawing, in

401' which Figure 1 shows a vertical'secti'on through a machine according to the invention.

Figure 2 shows a vertical section on the line 2--2 in Figure 1.

Figure 3 is a planview of the machine.

Figures 4 and 5 show in side-view and plan view one half of the support on the working table according to a modified embodiment. Figures 6 and 7 show in side view and plan view respectively a stamping member corresponding thereto( Figures 8 and 9 show in vertical section and plan View another embodiment of the machine.

Figure 10 shows the cutting portion of the stamp in front view, and Figure 11 a section on the line 565 ItI-II in Figure 8. Y

Figure 12 shows in a similar section another embodiment of the cutting portion of the stamp..

In the embodiment shown in Figures 1 to 3, the frame. of the apparatus consists of a horizontal foot l provided with ears 2, 3 for clamping the frame to a suitable foundation avertical portion 4, which forms part of a cylinder, and an upper horizontal portion 5 which supports. the.. stamping-pad or support for the plate. Said stamping pad isa substantially cylindrical body composed of two symmetrical parts E, 'L inserted in a conical recess in the portion 5, said halves forming a plane supporting surface. 3.' for the metal plate. In said pad 5., 'I is. provided a slit shaped recess 9 formed by milling the opposite sides of the two halves. 5, l. Disposed in said recess is. the stamp Iii which consists of a disk having parallel side surfaces and which is. swingably mounted on a pivot I I which extendsy transversely o-f the slot and is formed by two extensions of the Yhalves 6, I which project towards each other. The pivot II is cut off along a plane. coinciding with the supporting surface 8. The axis of said pivot may be positioned above or be-v low the surface 8. The stampingdisk Ill is. provided with a bore I2 corresponding to the. pivot. II and with two guiding edges I3, I4 which are concentric with said bore and which, on move.- ment of the stamp, slide along the corresponding cylindrical end surfaces in the slit 9. The stamp has also two straight parallel edgesA I5, I6 one of which, I6, bears against the upperplane surface of a waddling disk II mounted in a conical recess I8. in the pad 6., l. The waddling disk is provided with a shank I9, the lower button-shaped end 2i] i Ul of which is received in an eccentric recess 2I in the end wall 22 of a pulley 23 which is j ournalled on a cylindrical extension 24 of the pad 6, 'l and which with its end wall 22 rests on an elevated portion 25 of the foot I of the frame. The convex surface of the waddling diskA II is shaped as a truncated spherical calotte the centre of which is positioned in the extension of the axis ofthe waddling disk. On rotation of the pulley 23, the button-shaped end 2li of the shank I9 will perform a revolving movement, the longitudinal axis of Vthe waddling disk then describing a revolving movement in the surface of a cone. The stamping disk Ill is arranged in such position that its swinging axis intersects the axis of the cone traced by the axis of the waddling disk. Consequently7 the stamping disk will perform a swing,- ing movement about the pivot II in the plane of the guiding slit 9. Y

The Vstamping disk is provided with a cutting portion in the shape of a tooth 26 formed by two notches 21, 28 in the periphery of the disk. The

Vtooth has the same'width as the slit l0. The por- Ysides of the stamp.

When the machine is used, the plate is moved on tothe stamping disk along the plane upper surface 8 of the stamping pad. VSince the stamping disk I9 is performing a rapid swinging movement, the plate will move in `under 'the tooth 26 and a corresponding portion of the plate will be stamped out each time the tooth moves in the direction towards the pad down intol the slit 9. The cuttings drop into a recess ,or hollow 3l in the pad and pass from here out of theimachine through a recess 32 in the frame portion 5. When the cutting edges of the tooth have become worn, the pad can be readily taken apart and the stamping disk Il)k turned round, so that Vthe opposite side of the tooth becomes operativel` When the corresponding edges of the slit 9 become worn the stamping disk Ill-can also be turned, so that thetooth willact in the diagrammatically opposite end of the slit V9. For said purpose similarV recesses 33 and 34 are provided at the opposite side of the pad and frame respectively through which the cuttings can leave theV machine.

In order that the stamping disk l0 shall be securelyA guided in the slit 9 circular recesses 35V,

that are concentric with vthe pivot l l may be provided in the VV,opposite side surfaces of the parts 6, 1 as shown in Figures 4 and 5, the stamping disk being provided with a hub 35, Figures 6 and 7, fitting into said recesses. Y shown in Figures 6 and V'I the stamping disk is provided lwith an open slitY at the end opposite Vthe tooth 26, and in addition the portion 29 im- Y mediately behind the tooth has a section which tapers towards the centre of the disk fornthe purposejof enabling shearing to be effected along lines having a comparatively small radius Vof curvature.

In theV embodiment shown in Figures 8Y and.9 those portions ofthe support or pad`6, 1 which are,

particularly subjected topwear are formed by detachable rings and ring segments inserted in kcircular slots in thepad. There are thus provided two inner ring segments 31, 38, `each of vwhich is,

somewhat smaller than a semicircle in orderto leave both ends of the slit 9 free, and alsoY an outer ring 40 which is provided with an open slit atr39. and embraces thetwo first mentioned ring segments. Said ring-shaped portions are placed in a slot provide-d in the pad 6, 1, which slot is limited on its outer side by the upper portion of the cylindrical frame 4|, provided with open slits at 42sothat it .can be slightly compressed. The ringshaped parts 31, 38 and 40 4are held in position by means of .a ring 43 embracing the upper part of y the frame 4 I, which ring is provided with an open Y clamps the ring-shaped parts 31, 38, 40 in position.V

slitl atf44 and is adapted'to be tightened around the frame, by means'of a screw bolt 45 so that the upper portion of the frame is compressed and Therportions of said parts,whichare subjected to-wear, are thevends 46, 41 Vof the ring segments 31, 38 and the portion-48of the ring 40 positioned right opposite the slit 9. Thanks'to the described arrangement of the rings 31, 38, 40 said edge portions 46, 41, 48 can be easily renewed according as they are worn out. The outer ring 4B can be lsuccessively turned,l sothat new sharpedge In the embodiment tioned therebelow which in this embodiment is somewhat pointed or bulged out on its fore side so as'to provide space for the expansion of the cuttings at opposite sides ofthe middle portion 'of the supporting edge. However, the supporting edge can also be given another cross-sectional shape. The front side can thus be straight, as

Vshown in Figure 12. The cutting portion 49 of the stampcan, if desired, also consist of a replaceable memberof hardened steel.V

In the embodiment shown in Figures 8 and 9 Y the frame 4I isV assumedY to consist of acylindrical body, the driving means then consisting preferablyof an electric motor mounted-within the frame with its shaft perpendicular to the upper surface 8 of the stamp.

Iclaim:- i A vf 1. A nibbling machine comprising a stamping pad the upper surface of which forms the sup-l`V porting surface for Vthe plate tobe cut, a slitf.. Y

shaped recess in said stamping pad,` a stamp.

swingably mounted within said recess, a bearing for said stamp havingv its axis located in close.

proximity to said supporting surface and comprising concentric segmental sliding .surfaces arranged-below said surface, a pad supporting frame, a motor for driving the stamp, and amo-f tion mechanism for imparting a swinging motion to Y the stamp, said *motion mechanism being` mounted in said frame below the stamping pad.

2. A nibbling machine comprising a stamping pad the upper surface of which forms the sup-` porting surface for-the plate to be-cut, a slitshaped recess in said stamping pad, a stampv swingably mounted within said recess, ahalf-cy-n Y lindrical pivot for said stamp disposed trans-- versally of said recess and having its fiat` surface at a level with the upper surface of the stamping pad, a pad supporting frame, a motor for driving the stamp, and a motion mechanism for impart-- ing a swinging motion to the stamp, said motionv mechanism being mounted in said frame below the stamping pad. i

- 3. A nibbling machine as claimed in claim'i2.- in which the stamping pad consists of two detachable symmetrical halves, -the recess for the" stamp forming a space between the two halves.

4. A nibbling machine comprising a stamping pad the upper surface of which forms the supporting surface for the plate to be cut, a slitshaped recess in said stamping pad, va stamp swingably mounted within saidrecess, a pivot for said stamp disposed transversally of said recessV close-to the upper surface of the stamping pad, circular recesses in the pad, detachable ring shaped parts `placed in said circular recesses and forming the cutting edges of" the pad, a clamping ring embracing said ring-shaped parts so as to hold the latter firmly in place, a pad supporting frame, a motor for driving the stamp, and a motion mechanism for imparting a swinging motion to the stamp, said motion mechanism being mounted'in'said frame below the stamping pad.

5. A nibbling machine as claimed in claim 4,

in which the ring-'shaped parts comprise two in-i ner ring segments the opposite end portions o'f which form the sides of the pad opening for the stamp, and an outer split ring the inner edge of which forms the outer side of said opening.

6. A nibbling machine as claimed in claim 4, in which the pad has a circular form and is clamped to the upper cylindrical portion of the frame by means o-f the clamping ring.

'7. A nibbling machine comprising a stamping pad the upper surface of which forms the supporting surface for the plate to be cut, a slitshaped recess in said stamping pad, a stamp swingably mounted within said recess, a pivot for said stamp disposed transversally of said recess close to the upper surface of the stamping pad, a pad supporting frame, a motor for driving the stamp, and a motion mechanism for imparting a swinging motion to the stamp, said motion mechanism being mounted in said frame beloWthe stamping pad.

8. A nibbling machine as claimed in claim 7 in which the stamp is driven from a rotating shaft through the intermediary of a Waddling disc the swinging axis of which is directed towards the swinging axis of the stamp.

9. A nibbling machine comprising a stamping pad the upper surface of which forms the supporting surface for the plate to be cut, a slitshaped recess in said stamping pad, a stamp swingably mounted Within said recess, a pivot for said stamp disposed transversally of said'recess close to the upper surface of the stamping pad, a pad supporting frame, a motor for driving the Y stamp mounted in said frame below the stamping pad, and a motion mechanism for imparting a swinging motion to the stamp comprising a Waddling disc adapted to be driven from a rotating shaft and mounted between a sliding edge of the stamp and a bearing surface of the pad so as to allow a sliding motion between the stamp and the Waddling disc.

10. A nibbling machine as claimed in claim 9 in which the waddling disc is provided with a pivot the outer end of which engages a recess provided eccentrically in a rotating disc.

KARL GUsTAF STBERG. 

